Fix frame delay getting copied over

src/ImageSharp/Image/ImageFrame{TPixel}.cs

@@ -30,6 +30,16 @@ namespace ImageSharp
         {
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ImageFrame{TPixel}"/> class.
+        /// </summary>
+        /// <param name="image">The image to create the frame from.</param>
+        public ImageFrame(ImageFrame<TPixel> image)
+            : base(image)
+        {
+            this.CopyProperties(image);
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageFrame{TPixel}"/> class.
         /// </summary>

src/ImageSharp/Image/Image{TPixel}.cs

@@ -79,7 +79,6 @@ namespace ImageSharp
         public Image(ImageBase<TPixel> other)
             : base(other)
         {
-            this.MetaData = new ImageMetaData();
         }
 
         /// <summary>
@@ -107,7 +106,7 @@ namespace ImageSharp
         /// <summary>
         /// Gets the meta data of the image.
         /// </summary>
-        public ImageMetaData MetaData { get; private set; }
+        public ImageMetaData MetaData { get; private set; } = new ImageMetaData();
 
         /// <summary>
         /// Gets the width of the image in inches. It is calculated as the width of the image